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| TM EV2303DN-00A 3A, 28V, 340KHz Synchronous Rectified Step-Down Converter EVALUATION BOARD The Future of Analog IC Technology TM DESCRIPTION The EV2303DN-00A is an evaluation board for the MP2303, a monolithic synchronous buck regulator. The MP2303 integrates 120m MOSFETS that provide 3A continuous load current over a wide operating input voltage of 4.75V to 28V. Current mode control provides fast transient response and cycle-by-cycle current limiting. An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops to 0.3A. This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components. FEATURES * * * * * * 3A Output Current Wide 4.75V to 28V Operating Input Range 3.3V Output, Adjustable from 0.80V to 25V Distributed Power Systems Pre-Regulator for Linear Regulators Notebook Computers APPLICATIONS "MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc. ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 4.75 - 28 3.3 3 Units V V A EV2303DN-00A EVALUATION BOARD Efficiency vs Load Current 100 95 90 EFFICIENCY (%) VIN=8V 85 80 75 70 65 60 55 50 0 VIN=12V VIN=24V (L x W x H) 2.0" x 1.5" x 0.5" (5.0cm x 3.8 x 1.2cm) Board Number EV2303DN-00A EV2303DN-00A Rev. 1.1 2/13/2006 VOUT=3.3V 1000 2000 3000 LOAD CURRENT (mA) EV2303_EC01 MPS IC Number MP2303DN www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved. 1 TM EV2303DN-00A - 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC EN SS C1 10nF C7 NS 1 2 R5 NS U1 BS IN SS EN 8 7 VIN GND MP2303 3 4 SW COMP 6 5 GND FB C3 4.7nF C10 470pF C4 NS VOUT SW D1 NS GND EV2303_S01 EV2303DN-00A BILL OF MATERIALS Qty 1 2 1 2 2 1 1 1 1 1 1 1 1 1 1 Ref C1 C2 C8 C3 C4 C7 C5 C9 C6 C10 D1 L1 R1 R2 R3 R4 R5 U1 Value 10nF 10F 4.7nF Description Package Manufacturer Part Number 0603 1210 0603 1210 0805 0805 SMD 0603 0603 0603 0603 SO8 Any Holystone Any Taiyo Yuden Any Any Sumida Any Any Any Any MPS C1210X106M035T Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 35V, X7R Ceramic Capacitor, 50V, X7R Open 22F Ceramic Capacitor, 16V, X5R 0.1F Ceramic Capacitor, 50V, X7R 470pF Ceramic Capacitor, 50V, X7R Open 10H Inductor, 4.45A 30.9k Resistor, 1% 4.42k Resistor, 1% 10k Resistor, 1% 100k Resistor, 5% Open Synchronous Step-Down Converter EMK325BJ226MM CDRH105R-100NC MP2303DN EV2303DN-00A Rev. 1.1 2/13/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved. 2 TM EV2303DN-00A - 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3--Bottom Layer EV2303DN-00A Rev. 1.1 2/13/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved. 3 TM EV2303DN-00A - 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER EVALUATION BOARD QUICK START GUIDE 1. Connect the positive and negative terminals of the load to the VOUT and GND pins, respectively. 2. Preset the power supply output to between 4.75V and 28V, then turn it off. 3. Connect the positive and negative terminals of the power supply output to the VIN and GND pins, respectively. 4. Turn the power supply on (the MP2303 will automatically startup). 5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 2.5V to turn on the regulator or less than 0.7V to turn it off. 6. An under voltage lockout (UVLO) function can be implemented by the addition of a resistor divider (R4 and R5). The Enable threshold is 2.5V, so the VIN UVLO threshold is: R4 1 + x 2. 5 V . R5 NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV2303DN-00A Rev. 1.1 2/13/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2006 MPS. All Rights Reserved. 4 |
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